Valve-operating means.



W. IVI. GOODWIN.

VALVE OPERATING MEANS.

APPLICATION FILED APR. 5. 19H3.

W. M. GOODWIN.

VALVE OPERATING MEANS.

APPLICATION FILED APR.5.19|B.

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VALVE-OPERATING MEANS.

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Application filed April t5, 19M. Serial No. Ql.

To all wim/m, t may concern:

Be it known that I, WiLLIAM M. Goonwnv, a citizen of the United Statesof America, and resident of Central Square, in the county ot tlswego, inthe State of New York, have invented new and useful lmprovements inValve-perating Means, of which the following, aken in connection withthe accompanying drawings, is a full, clear, and exact description.

This invention relates to certain improvements in valve-operating meansfor internal combustion engines, involving the use of the usual puppetvalves, cam shaft and means for transmitting motion :trom the cams tothe valves, except that ll prefer to employ rocker contacts forengagement with their respective cams, the object of which is tomaintain uninterrupted connection between each cam and its valve throughthe transmitting mechanism so that all of the parte necessary to theoperation of the valve may move freely, yet positively, with a minimumlost motion and to thereby render such operation substantiallynoiseless.

ln other words, ll have sought to provide what may be termed acompensating rocker contact spring-pressed into engagement with 'thesurface of its cam for the purpose ol taking up any lost motion in theconnections between the rocker contact and valve stem, and at the sametime causing a gradual, but positive. opening and closing of the valvetoreduce the noise and shock incidental to such operation.

A @ther objects and uses relating to specilic parte of my invention willbe brought out in the following description.

lln the drawings- Figure l is a vertical sectional view, partly inelevation. of what is commonly known as a side valve and its operatingmeans including the cam shaft and one form of my improved rockercontact.

Figs. 2 and 3 are transverse sectional views taken, respectively, onlines 2-2 and 3 3, Fig. l. Fig. l is a vertical sectional view partly inelevation of a modified construction as used in connection with what iscommonly known as valve in the head machines. in which each valve ismovable at an angle to a vertical plane.

Fie'P 5 is a vertical Sectional vev of a Specification of LettersPatent.

Patented 'J fr?, wird iturther modii'ied torni adapted to be used withvalve in the head engines.

Fig. 6 isa vertical sectional view partly in elevation of anothermodilication of my invention as used in connection with the side valvessimilar to that shown in Fig. l, except that a portion of thevalve-closing spring is utilized for maintaining` contact between thecorresponding rocker arm and its cam.

ln each of the several modifications shown, the valve, as --l-, servesto control one of the ports, as -2-, of an internal combustion engine-3- and is provided with a. stem l-h guided in a bearing or way -5-- ofthe engine cylinder for reciprocatory axial movement.

A cupshaped collar is secured to the outer end ot' the valve stemdebeyond the bearing --ea a suliicient distance to permit the axialmovement referred to, and serves to receive one end of a coil spring`-1-7 having its opposite end bearing against a portion of the engine-3-around the guide boss -5-, said spring being` tensioned to close thevalve -land hold it closed under yielding pressure in the usual manner.

its shown in l, the outer or lower end ot the valve stein is adapted tobe engaged by a coaxial and longitudinally movable tappet screw -tlwhichadjustl ably secured in the upper end of a vertically movable plunger 9-and is locked in its adjusted position by a iam nut -lO-.

'llhe plunger 9 is movable vertically in a guideway -llforming a part ofthe engine frame, said plunger being held against turning movement hymeans of a key -]l2-.

The plunger -9- extends below its guideway -ll and is provided at itslower end with a vt'orked head -13- for receiving and supporting arocker Contact member *ML- itor engagement with the surface of a.revolving earn -15- of the usual cam shaft -l6- l l'n this particularinstance. the valve -l-, tappet -8 and plunger -9-- are coaxial withtheir axes in the same vertical plane as that o't the axis of' the camshalt ot my invention vertically movable is pivthe head 13- so that itsaxis of movement may be parallel with and in the same vertical plane asthat of the cam shaft.

The object in holding the plunger Q against turning movement about itslongitudinal axis is to keep the rocker M up in operative relation toits operating cam 15 The cam shaft and its cams l5 are rotated in thedirection indicated by the arrow, and in each of the severalmodiiications, the rocker I4- extends laterally some distance beyondopposite sides of a direct line between its axis and that of the camshaft, the lower contact face thereof being convexed longitudinally andis normally tilted toward the upwardly moving or approaching 'side ofthe high point of the cam and held in that position, as shown in Figs. land 2, by means of a coil spring 18 ln the modification shown in Fig.1-, the rocker contact member M is pivot-ed at 17 to a reciprocatorymember or support 9 consisting, in this instance, of one arm of abell-crank lever which is fulcrumed at, 19 to the engine frame or otheravailable support, and has its other arm provided with a tappet screw 8and lock nut l0 similar to those shown in Fig. l, except that thearrangement of the screw and puppet falve are reversed over that shownin Fig. l.

rlfhe toe ot the rocker contact letis spring-pressed toward theapproaching side of the cam 15 by means et a coil spring l8 which isinterposed between socketed extensions 20 and 21 on the rocker M andlever 9 respectively.

ln Fig. 5, the rocker M is mounted upon a reciprocatory plunger 9carrying at its upper end a tappet screw 8 and lock nut 10 and ispreferably hollow or chambered for receiving a longitudinally movablepresser foot 22 and coil spring Q3- rl`hi's presser toot 22 is movablelongitudinally in the chambered member 9 but is normally spring-pressedoutwardly by the spring 23 against the toe of the rocking contact M forthe same purpose as the springs l8 and 18 previously described that is,to take up any lost motion in the connections between the valve and camshaft, thus reducing to a minimum the liability of excessive noiseincidehtal to such lost motion.

lt might be stated here that this lost motion is frequently the resultof improper adjustment of the tappet screws, or it sometimes happensthat the adjustment may be made substantially perfect when the engine iscold, and that the lost motion and consequent pounding or noise willdevelop as the engine becomes heated, or vice versa, and one of theobjects of my invention is to avoid the necessity for such closeadjustments, and

at the same time to compensate tor expansion and contraction ot any orall of the connections between the cam shaft and valve under vanvingtemperatures ot the engine.

As shown in Fig. a tappet bur --Ql-- is interposed between the tappetscrew l-- and oneI end ot a lever 2:1 which is centrally tulcrumcd atYf.($ upon a portion ol the engine and has its other end adapted toengage the adjacent end ot' the valve stem l for opci'iing the valveagainst the action ot' its rctracting spring` 7 ln Fig, (i, the rocherl4 is `shown as pivotally mounted upon the collar on the valve stein -lfor engagement with the surface ol its cam --l.3

The toe of the rocker lt is yieldingly forced toward the approachingside ot the high point ot the cani l5- by means ot a rod 2T which isguided in a suitable way 28 in the collar (5 and is provided at itsupper end with a forked head M adapted to interengage with the adjacentside of one ot' the coin'olutions of the spring 7 the'head Q5) beingadjustable on the rod 27 to bring about the desired tension on the tocof the rocker lt lt will be noted that in each ol the severalmodifications; the toe ot' the rocltcr l-l is spring-pressed against theperiphery ol the cani .l5 at the 'saine side ot a direct line betweenthe axis ot' the cam shaft and that ot the rocker, and while thispressure is considerably lighter than that produced by the mainvalve-operating spring, it nevertheless is of sulticient tension toyieldiiigly hold all separable parts of the connections, as for examplebetween the tappet screws and valve stems7 in close contact. undervarying teniperature conditions, but does not have any direct influencein either closing or opening the valve. For example, as best illustratedin Fig'. i5, it will be seen that `the spring 23 tends to distend thetelescoping parts Q and 22 that is it tends to force the plunger Q withits tappet screw 8 uiwardly, and at the same time to force tie innerpart 2 downwardly into contact with the toe ot the rocker lltoyieldingly hold the latter in contact with the face of the cam l5 hThismeans with the tappet screw S- is yieldingly held in contact with thelower end of the aart 22B- which in turn is yieldingly he d in contactwith the adjacent arm of the lever 25 the opposite arm of said leverbeing yieldingly held by the same spring in contact with the stem ot thevalve 1 tending to open said valve, but resisted by the mainvalve-controlling springV which is of considerably greater tension thanthe rocker-operating spring 23 It is now clear that while the valve 1may be closed by the spring 7 the spring llli Zilli Btl maretti -23-lteeps the entire chain ot connections between the cani shaft and valvein yieldingl Contact without in any way interfering with the positiveopening and closing of the valve, all of which contributes materially tothe noiseless peration of the valve operating mechani i; reduces theWear of those parts, including the valve, and at the same time increasesthe power eiiciency ot the engine.

Furthermore, it will be noted that atthe beginningr of operation ot' thecam upon the rockingl member 14` to operate the valve -1-, the point otcontact will be some distance to one side of a. direct line between theaxes of the cam shaft and rocker toward the toc ot' said rocker, therebyexerting" an initial I'ircssurc and movement of the member -22- againstthe action of the spring' -23-, and at the same time tensioning all ofthe connections between the rocker and. valve ready to receive thepositive thrust of the point of the cam against the rocker in the directline between said axes, whereupon vmotion is transmitted directly fromsaid cam to the plunger -9-, and thence through the remainingconnections to the valve to cause a positive openingl or the latteragainst the action of its retracting spring -7-.

ln reverse. manner, as the point of the cani leaves the center ofContact of the rocker and travels toward the heel of 'the rocker, itwill gradually ease oft' the closing ot the valve by its spring -7-instead of allowing it to close with a sudden impact.

What l claim is:

l. ln combination with the cam shaft and Yalve of an internal combustionengine, a spring for closingthe valve and connections between the canishait and valve for opening the saine against the action ot said spring,including a reciprocatory support, and a rocker pivotally mountedthereon and springpressed against the face ot' the cam.

2. In combination with the cam shaft and valveof an internal combustionengine, a springl for closing the valve and connections between the camshaft and valve for opening,r the saine against the action of saidspring, including` a reciprocatory support, and a rocker pivotallymounted upon said support to swing about an axis parallel with that otthe cam shat't and having a portion thereof overhang'ing the approachingportion of the cam and spring-pressed into en gagement with said cani.

3. rllhe combination with a cam shaft and a valve ot' an internalcombustion engine, and a spring for closing said valve, of areciprocatory support movable in a line substantially radial to the axisof the earn shaft, means `for transinittingmotion from said support tothe valve to open the latter against the action of its retractingspring,a rocker pivotally mounted on said support with its airis in said radialline and parallel with that of the cam shaft, said rocker be ingspring-pressed into Contact with the surface ot' the cam. y v

In witness whereof li have hereunto set my hand this th day of March,i918.

VVILLAM M. GODVWN. Witness:

H. i3. CHASE.

